"I feel really scared because I have asked for a transfer to be closer to the hospital and they have said that will take seven or eight years so I could be dead by then," said Dianne Smith from the Bellamack Seniors Village.

Mrs Smith suffers from sleep apnoea and uses a machine to open her airways and provide her with oxygen while she sleeps.

"There was no follow-up by Power and Water, there was no follow up by Telstra, there was no follow-up by the Department of Health," she said.

During the blackout on 12 March, which also disrupted landline and mobile phones, Chief Minister Adam Giles said the Royal Darwin Hospital had made contact with patients who required life support and oxygen.

Mrs Smith says she is registered as an at-risk patient with Power and Water and Telstra, and she thought she would be checked by the Department of Health if the power went off, too.

Checks by the ABC with authorities showed Mrs Smith was not on a list of vulnerable people living in the community, although the Department of Health would not reveal why that was the case, citing patient privacy.

"Anyone with serious health issues should contact their health care provider to discuss whether they should be registered as medically vulnerable for emergency situations", the Department said in an email.

There are 40 homes in the estate that forms the Bellamack Seniors Village, and 56 elderly people live there, some of whom told the ABC they felt forgotten during the blackout.

"I honestly don't think anybody cares. Once you get over a certain age, that's it," said 82-year-old Jenny McSweeney, who lives alone.

"It was very bad really and it must have been bad for a lot of people," said Neroli Bennett, aged 72.